Brembo calipers are used on the Track models, but there is a slight possibility that they could be aftermarket. Heck, even leather seats can be aftermarket. You should be able to contact Nissan with the VIN to find out how it was originally equiped, if you have the time.
BTW, it's not VIN number - VIN means Vehicle Identification Number, so "VIN number" is like saying Vehicle Identification Number Number. That's almost as bad as saying rpms! RPM means Revolutions Per Minute, saying rpms is like saying revolutions per minutes, or something silly like that. Z owners shouldn't use the wrong words and appear foolish to other marks.... :doh: :rolf2: